The preparation method is one of the key factors affecting the specific surface area of oxide powders. Different preparation methods can lead to differences in the size, shape, and porosity of powder particles, thereby affecting their specific surface area.
For example, the sol gel method can prepare oxide powders with high specific surface area, uniform particle size and fine size; The co precipitation method can optimize the specific surface area of the powder by controlling the precipitation conditions. Therefore, when selecting the preparation method, it is necessary to choose the appropriate process according to the specific application requirements.
1) Sol gel method: characteristics: solid precursor is formed through sol polymerization and gel process, and oxide powder is obtained after heat treatment. Comparison of surface area effects: High specific surface area, uniform particle size, and fine oxide powders can be prepared. The specific surface area of the powder can be adjusted by controlling the concentration of sol, gel conditions and heat treatment temperature.
2) Co precipitation method: Characteristics: The precursor is obtained by precipitating the uniformly distributed components in the solution according to the stoichiometric ratio, and then the oxide powder is obtained through calcination and other treatments. The influence of surface area comparison: oxide powders with good dispersibility and high specific surface area can be prepared. By controlling the precipitation conditions (such as pH value, temperature, stirring speed, etc.) and parameters such as calcination temperature and time, the specific surface area of the powder can be optimized.

3) Mechanical ball milling method: Characteristics: Grinding raw material powder into finer particles through mechanical force. The impact of surface area comparison: Although mechanical ball milling can reduce particle size, it often leads to irregular particle shapes and increased surface defects, thereby affecting the precise control of specific surface area. However, by optimizing ball milling parameters such as milling time, milling medium, ball to material ratio, etc., the specific surface area of the powder can be increased to a certain extent.

4) Chemical Vapor Deposition (CVD): Characteristics: Gaseous precursors are deposited on a substrate through chemical reactions at high temperatures to form oxide films or powders. The influence of surface area comparison: CVD method can prepare high-purity and high specific surface area oxide powders or films. By controlling parameters such as sedimentation temperature, gas flow rate, and reaction time, the specific surface area of the powder can be precisely regulated. 5) Spray pyrolysis method: features: metal salt solution or sol is sprayed into the high-temperature pyrolysis furnace through a spray to rapidly evaporate the solvent and generate pyrolysis reaction, forming oxide powder. High sphericity and narrow particle size distribution oxide powders can be prepared. Applicable situation: Suitable for the preparation of spherical oxide powders with high specific surface area and uniform particle size distribution.

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